Cathodic hydrogen embrittlement of a 22% chromium 5% nickel duplex stainless steel in sulfide containing 3.5 wt% NaCl solution

Book · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:268240

Tsai, S Y ^[1]; Shih, H C ^[2]; Yen, K P ^[3]

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1. Industrial Technology Research Inst., Hsinchu (Taiwan, Province of China). Materials Research Labs.
2. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering
3. National Chung Hsing Univ., Taichung (Taiwan, Province of China). Inst. of Materials Engineering

Hydrogen embrittlement (HE) of a 2,205 duplex stainless steel has been studied by slow straining of tensile specimens in sulfide containing 3.5 wt% NaCl solution. A more complex sulfide-concentration-dependent loss in ductility was discovered at controlled potentials in {minus}1,100 mV (SCE). It is believed that HE was controlled by the critical concentration of S as a promoter at lower sulfide levels and recovery of ductility at higher sulfide concentrations was attributed to the role of the sulfide as a cathodic inhibitor. No stress corrosion cracking (SCC) was observed at anodic polarization in this system. The electrochemical results indicate that the corrosion potentials of 2,205 duplex stainless steel in 3.5 wt% NaCl solution move to the less noble direction with increasing the sulfide concentration or with decreasing the solution acidity. This trend was not influenced by the presence of dissolved oxygen. Under severe HE environments transgranular cleavage is the favored path for cracking.

• OSTI ID: 268240
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
CHROMIUM-NICKEL STEELS
CORROSIVE EFFECTS
ELECTROCHEMICAL CORROSION
EXPERIMENTAL DATA
FRACTOGRAPHY
HYDROGEN EMBRITTLEMENT
MECHANICAL TESTS
MICROSTRUCTURE
OFFSHORE SITES
PIPELINES
POLARIZATION
SODIUM CHLORIDES
STRAIN RATE
SULFIDES